feature/mx-1500 speed-up wikidata tests (#68)

# PR Context

- profiling the tests with cProfile and snakeviz showed wikidata tests
are only slow because of HTTP requests
- we checked the tests and they are all valid (no HTTP calls that could
be cut from the integration tests)
- instead we added pytest plugins to randomize order (always good idea
to detect bad test isolation) and to distribute test workload to all cpu
cores (this should speed up the test runs)

# Added
- pytest plugins for random order and parallelized test execution

# Changes
- `.\mex.bat test` uses random order and xdist plugins by default

CHANGELOG.md

@@ -9,8 +9,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- pytest plugins for random order and parallelized test execution
+
 ### Changes
 
+- `mex.bat test` uses random order and xdist plugins by default
+
 ### Deprecated
 
 ### Removed

mex.bat

@@ -32,9 +32,10 @@ echo linting all files
 pre-commit run --all-files
 if %errorlevel% neq 0 exit /b %errorlevel%
 
-@REM run the pytest test suite with unit and integration tests
+@REM run the pytest test suite with unit and integration tests in random order
+@REM distributed across all available CPU cores
 echo running all tests
-poetry run pytest
+poetry run pytest --random-order-bucket=global --numprocesses=auto --dist=worksteal
 exit /b %errorlevel%